Choose the option which correctly fills in the blank with a suitable article (if required).
What time do you have ______ lunch?

Correct option is B

The correct answer is (b) No article.
In the given sentence, lunch is used in a general sense and is not specified. Hence, no article is required before it.
• Grammatical rule involved (English):
Names of meals such as breakfast, lunch, and dinner generally do not take an article when they are used in a general sense. An article is used only when the meal is specified or qualified by a phrase or clause.
• व्याकरण नियम (Hindi):
भोजन के नाम जैसे breakfast, lunch और dinner जब सामान्य अर्थ में प्रयोग होते हैं, तो उनके पहले article का प्रयोग नहीं किया जाता। यदि भोजन किसी विशेष स्थिति या विवरण के साथ प्रयोग हो, तभी article लगाया जाता है।
• Meanings / role of the other options:
• (a) the: Used for something specific, which is not implied here.
• (c) a: Cannot be used because lunch is an uncountable noun.
• (d) an: Grammatically incorrect as lunch does not begin with a vowel sound.
Thus, the correct option is No article.